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                    step2：一元操作
            
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                    step3：加减乘除模
            
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                                <h2 id="&#x4EE3;&#x7801;&#x751F;&#x6210;">&#x4EE3;&#x7801;&#x751F;&#x6210;</h2>
<p>&#x672C;&#x9636;&#x6BB5;&#x4EE3;&#x7801;&#x751F;&#x6210;&#x7684;&#x91CD;&#x70B9;&#x662F;&#x5904;&#x7406; <code>*</code> &#x548C; <code>&amp;</code> &#x8FD9;&#x4E24;&#x4E2A;&#x8FD0;&#x7B97;&#x7B26;&#xFF0C;&#x800C;&#x5BF9;&#x4E8E;&#x7C7B;&#x578B;&#x7CFB;&#x7EDF;&#x548C;&#x5F3A;&#x5236;&#x7C7B;&#x578B;&#x8F6C;&#x6362;&#x5C5E;&#x4E8E;&#x8BED;&#x4E49;&#x68C0;&#x67E5;&#xFF0C;&#x65E0;&#x9700;&#x751F;&#x6210;&#x4EE3;&#x7801;&#x3002;</p>
<p>&#x9996;&#x5148;&#xFF0C;&#x5BF9;&#x4E8E; <code>*</code> &#x8FD0;&#x7B97;&#xFF0C;&#x53EA;&#x9700;&#x4E00;&#x6761; Load &#x6307;&#x4EE4;&#x5373;&#x53EF;&#x5B8C;&#x6210;&#x89E3;&#x5F15;&#x7528;&#x8FD9;&#x4E00;&#x64CD;&#x4F5C;&#x3002;&#x4F46;&#x5BF9;&#x4E8E;&#x53D6;&#x5730;&#x5740;&#x7B26; <code>&amp;</code> &#x5C31;&#x4E0D;&#x662F;&#x5F88;&#x76F4;&#x89C2;&#x4E86;&#xFF0C;&#x56E0;&#x4E3A; <code>&amp;</code> &#x53F7;&#x540E;&#x9762;&#x53EF;&#x80FD;&#x4E0D;&#x4F1A;&#x7ACB;&#x5373;&#x8DDF;&#x4E00;&#x4E2A;&#x53D8;&#x91CF;&#x5982; <code>&amp;a</code>&#xFF0C;&#x800C;&#x662F;&#x4F1A;&#x6709;&#x5F62;&#x5982; <code>&amp;*p</code> &#x8FD9;&#x6837;&#x7684;&#xFF0C;&#x867D;&#x7136;&#x4E24;&#x4E2A;&#x64CD;&#x4F5C;&#x53EF;&#x4EE5;&#x76F8;&#x4E92;&#x62B5;&#x6D88;&#xFF0C;&#x4F46;&#x5982;&#x679C;&#x5C06;&#x5176;&#x89E3;&#x91CA;&#x4E3A;&#x201C;&#x5148;&#x89E3;&#x5F15;&#x7528;&#xFF0C;&#x518D;&#x53D6;&#x5730;&#x5740;&#x201D;&#xFF0C;&#x5C31;&#x96BE;&#x4EE5;&#x751F;&#x6210;&#x5BF9;&#x5E94;&#x7684;&#x6C47;&#x7F16;&#x4EE3;&#x7801;&#xFF0C;&#x56E0;&#x4E3A;&#x53D8;&#x91CF;&#x7684;&#x5730;&#x5740;&#x4FE1;&#x606F;&#x4F1A;&#x5728;&#x89E3;&#x5F15;&#x7528;&#x540E;&#x4E22;&#x5931;&#x3002;&#x6B64;&#x5916;&#xFF0C;&#x5BF9;&#x4E8E;&#x50CF; <code>*</code> &#x53F7;&#x51FA;&#x73B0;&#x5728;&#x8D4B;&#x503C;&#x8BED;&#x53E5;&#x5DE6;&#x8FB9;&#x7684;&#x60C5;&#x51B5;&#xFF0C;&#x4E5F;&#x4E0D;&#x662F;&#x5F88;&#x597D;&#x5904;&#x7406;&#x3002;&#x56E0;&#x6B64;&#xFF0C;&#x5728;&#x8BA8;&#x8BBA;&#x5982;&#x4F55;&#x751F;&#x6210;&#x4EE3;&#x7801;&#x4E4B;&#x524D;&#xFF0C;&#x6211;&#x4EEC;&#x5148;&#x6765;&#x8BA8;&#x8BBA;&#x4E00;&#x4E0B;&#x201C;&#x5DE6;&#x503C;&#x201D;&#x7684;&#x6982;&#x5FF5;&#x3002;</p>
<h3 id="&#x5DE6;&#x503C;">&#x5DE6;&#x503C;</h3>
<p>&#x6211;&#x4EEC;&#x90FD;&#x77E5;&#x9053;&#xFF0C;&#x8D4B;&#x503C;&#x8BED;&#x53E5;&#x53EF;&#x4EE5;&#x5199;&#x6210; <code>a = 123</code> &#x7684;&#x5F62;&#x5F0F;&#xFF0C;&#x800C;&#x4E0D;&#x80FD;&#x662F; <code>123 = a</code>&#xFF0C;&#x8FD9;&#x662F;&#x56E0;&#x4E3A;&#x8D4B;&#x503C;&#x53F7;&#x5DE6;&#x8FB9;&#x7684;&#x662F;&#x4E00;&#x4E2A;<strong>&#x5DE6;&#x503C;</strong>&#xFF08;lvalue&#xFF09;&#xFF0C;&#x8981;&#x6C42;&#x4E0E;&#x4E00;&#x4E2A;&#x5730;&#x5740;&#x76F8;&#x5173;&#x8054;&#xFF1B;&#x800C;&#x53F3;&#x8FB9;&#x7684; <code>123</code> &#x662F;&#x4E00;&#x4E2A;<strong>&#x53F3;&#x503C;</strong>&#xFF08;rvalue&#xFF09;&#xFF0C;&#x5E76;&#x4E0D;&#x9700;&#x8981;&#x5173;&#x8054;&#x4E00;&#x4E2A;&#x5730;&#x5740;&#x3002;&#x901A;&#x4FD7;&#x5730;&#x8BB2;&#xFF0C;&#x5DE6;&#x503C;&#x662F;&#x4E00;&#x4E2A;<strong>&#x6709;&#x5730;&#x5740;&#x7684;&#x503C;</strong>&#xFF0C;&#x4F8B;&#x5982;&#xFF1A;</p>
<pre><code class="lang-c"><span class="hljs-keyword">int</span> a;
<span class="hljs-keyword">int</span>* p;
a = <span class="hljs-number">1</span>;      <span class="hljs-comment">// a &#x662F;&#x5DE6;&#x503C;</span>
*&amp;a = <span class="hljs-number">2</span>;    <span class="hljs-comment">// *&amp;a &#x662F;&#x5DE6;&#x503C;</span>
p = &amp;a;     <span class="hljs-comment">// p, a &#x662F;&#x5DE6;&#x503C;</span>
*p = <span class="hljs-number">3</span> + a; <span class="hljs-comment">// *p &#x662F;&#x5DE6;&#x503C;</span>
</code></pre>
<p>&#x4ECE;&#x4E0A;&#x8FF0;&#x4EE3;&#x7801;&#x53EF;&#x4EE5;&#x770B;&#x51FA;&#xFF0C;&#x8D4B;&#x503C;&#x53F7;&#x5DE6;&#x8FB9;&#x7684;&#x4EE5;&#x53CA; <code>&amp;</code> &#x540E;&#x9762;&#x7684;&#x90FD;&#x8981;&#x6C42;&#x662F;&#x5DE6;&#x503C;&#xFF0C;&#x9700;&#x8981;&#x77E5;&#x9053;&#x5B83;&#x4EEC;&#x7684;&#x5730;&#x5740;&#x624D;&#x80FD;&#x8FDB;&#x884C;&#x8BA1;&#x7B97;&#xFF1B;&#x800C;&#x50CF;&#x51E0;&#x4E2A;&#x5E38;&#x91CF;&#x548C;&#x6700;&#x540E;&#x4E00;&#x884C;&#x7684; <code>a</code> &#x8FD9;&#x6837;&#x7684;&#x662F;&#x53F3;&#x503C;&#xFF0C;&#x53EA;&#x9700;&#x77E5;&#x9053;&#x5176;&#x503C;&#x5C31;&#x884C;&#x4E86;&#x3002;</p>
<p>&#x6709;&#x4E86;&#x5DE6;&#x503C;&#x7684;&#x6982;&#x5FF5;&#xFF0C;&#x5C31;&#x6BD4;&#x8F83;&#x5BB9;&#x6613;&#x5904;&#x7406;&#x672C;&#x8282;&#x4E00;&#x5F00;&#x59CB;&#x63D0;&#x5230;&#x7684;&#x54EA;&#x4E9B;&#x95EE;&#x9898;&#x4E86;&#x3002;&#x4F8B;&#x5982;&#x5BF9;&#x4E8E; <code>&amp;a</code> &#x548C; <code>&amp;*p</code>&#xFF0C;&#x53EF;&#x770B;&#x505A;&#x6C42;&#x5DE6;&#x503C; <code>a</code> &#x548C; <code>*p</code> &#x7684;&#x5730;&#x5740;&#xFF08;&#x4E0D;&#x8003;&#x8651;&#x7A7A;&#x6307;&#x9488;&#xFF0C;<code>*p</code> &#x7684;&#x5730;&#x5740;&#x5C31;&#x662F; <code>p</code> &#x7684;&#x503C;&#xFF09;&#xFF0C;&#x5BF9;&#x4E8E;&#x8D4B;&#x503C; <code>*p = 1</code>&#xFF0C;&#x53EF;&#x4EE5;&#x770B;&#x505A;&#x5148;&#x6C42;&#x5DE6;&#x503C; <code>*p</code> &#x7684;&#x5730;&#x5740;&#xFF0C;&#x518D;&#x5411;&#x8BE5;&#x5730;&#x5740;&#x5199;&#x5165; 1&#x3002;</p>
<p>&#x56E0;&#x6B64;&#xFF0C;&#x5728;&#x751F;&#x6210;&#x4EE3;&#x7801;&#x7684;&#x8FC7;&#x7A0B;&#x4E2D;&#xFF0C;&#x5BF9;&#x4E8E;&#x5DE6;&#x503C;&#xFF0C;&#x6211;&#x4EEC;&#x4E0D;&#x80FD;&#x751F;&#x6210;&#x5176;&#x5177;&#x4F53;&#x7684;&#x503C;&#xFF0C;&#x800C;&#x8981;&#x5148;&#x751F;&#x6210;&#x5B83;&#x4EEC;&#x7684;&#x5730;&#x5740;&#x3002;&#x5BF9;&#x4E8E;&#x4E00;&#x4E2A;&#x8868;&#x8FBE;&#x5F0F;&#xFF0C;&#x6211;&#x4EEC;&#x9700;&#x8981;&#x5148;&#x786E;&#x5B9A;&#x90A3;&#x4E9B;&#x90E8;&#x5206;&#x662F;&#x5DE6;&#x503C;&#xFF0C;&#x5E76;&#x6C42;&#x5F97;&#x5B83;&#x4EEC;&#x7684;&#x5730;&#x5740;&#x4F5C;&#x4E3A;&#x4E2D;&#x95F4;&#x7ED3;&#x679C;&#xFF0C;&#x7136;&#x540E;&#x624D;&#x80FD;&#x751F;&#x6210;&#x6B63;&#x786E;&#x7684;&#x4EE3;&#x7801;&#x3002;&#x901A;&#x8FC7;&#x89C2;&#x5BDF;&#xFF0C;&#x6211;&#x4EEC;&#x53EF;&#x4EE5;&#x5F52;&#x7EB3;&#x51FA;&#x5DE6;&#x503C;&#x7684;&#x5224;&#x5B9A;&#x65B9;&#x6CD5;&#xFF1A;</p>
<ol>
<li>&#x51FA;&#x73B0;&#x5728;&#x8D4B;&#x503C;&#x53F7; <code>=</code> &#x7684;&#x5DE6;&#x8FB9;&#xFF0C;&#x6216;&#x662F;&#x53D6;&#x5730;&#x5740;&#x7B26; <code>&amp;</code> &#x7684;&#x53F3;&#x8FB9;&#xFF1B;</li>
<li>&#x662F;&#x4E00;&#x4E2A;&#x6807;&#x8BC6;&#x7B26;&#xFF0C;&#x6216;&#x662F; <code>*</code> &#x5F00;&#x5934;&#x7684;&#x8868;&#x8FBE;&#x5F0F;&#xFF08;<code>(*p)</code> &#x7B49;&#x6709;&#x62EC;&#x53F7;&#x7684;&#x5F62;&#x5F0F;&#x4E5F;&#x7B97;&#xFF09;&#x3002;</li>
</ol>
<p>&#x5728;&#x5EFA;&#x7ACB;&#x4E86; AST &#x540E;&#xFF0C;&#x6211;&#x4EEC;&#x53EF;&#x4EE5;&#x5F88;&#x5BB9;&#x6613;&#x6C42;&#x51FA;&#x54EA;&#x4E9B;&#x8282;&#x70B9;&#x662F;&#x5DE6;&#x503C;&#xFF0C;&#x53EF;&#x5C06;&#x5176;&#x4F5C;&#x4E3A;&#x8282;&#x70B9;&#x7684;&#x5C5E;&#x6027;&#xFF0C;&#x4EE5;&#x4F9B;&#x4E4B;&#x540E;&#x4F7F;&#x7528;&#x3002;</p>
<p>&#x6B64;&#x5916;&#xFF0C;&#x6211;&#x4EEC;&#x8FD8;&#x9700;&#x8981;&#x8FDB;&#x884C;&#x5DE6;&#x503C;&#x68C0;&#x67E5;&#xFF0C;&#x4EE5;&#x62D2;&#x7EDD;&#x7F16;&#x8BD1;&#x5F62;&#x5982; <code>123 = a</code> &#x7684;&#x9519;&#x8BEF;&#x8F93;&#x5165;&#x3002;&#x6839;&#x636E;&#x4E0A;&#x8FF0;&#x5DE6;&#x503C;&#x7684;&#x5224;&#x5B9A;&#x65B9;&#x6CD5;&#xFF0C;&#x5982;&#x679C;&#x8868;&#x8FBE;&#x5F0F;&#x7684;&#x67D0;&#x4E00;&#x90E8;&#x5206;&#x6EE1;&#x8DB3;&#x7B2C; 1 &#x6761;&#xFF0C;&#x4F46;&#x4E0D;&#x6EE1;&#x8DB3;&#x7B2C; 2 &#x6761;&#xFF0C;&#x5C31;&#x662F;&#x4E0D;&#x5408;&#x6CD5;&#x7684;&#x3002;</p>
<h3 id="&#x57FA;&#x4E8E;&#x5DE6;&#x503C;&#x7684;&#x4EE3;&#x7801;&#x751F;&#x6210;&#x6846;&#x67B6;">&#x57FA;&#x4E8E;&#x5DE6;&#x503C;&#x7684;&#x4EE3;&#x7801;&#x751F;&#x6210;&#x6846;&#x67B6;</h3>
<p>&#x73B0;&#x5728;&#xFF0C;&#x6211;&#x4EEC;&#x5047;&#x8BBE;&#x5DF2;&#x7ECF;&#x6C42;&#x51FA;&#x4E86; AST &#x7684;&#x54EA;&#x4E9B;&#x8282;&#x70B9;&#x662F;&#x5DE6;&#x503C;&#x3002;&#x5728;&#x4E4B;&#x540E;&#x7684;&#x904D;&#x5386; AST &#x751F;&#x6210;&#x6C47;&#x7F16;&#x7801;&#x65F6;&#xFF0C;&#x53EA;&#x9700;&#x5BF9;&#x5DE6;&#x503C;&#x751F;&#x6210;&#x5730;&#x5740;&#xFF0C;&#x5BF9;&#x53F3;&#x503C;&#x751F;&#x6210;&#x503C;&#x3002;&#x5728;&#x6211;&#x4EEC;&#x7684;&#x6587;&#x6CD5;&#x4E2D;&#xFF0C;&#x5DE6;&#x503C;&#x4E00;&#x5B9A;&#x51FA;&#x73B0;&#x5728; <code>&lt;factor&gt;</code> &#x975E;&#x7EC8;&#x7ED3;&#x7B26;&#xFF0C;&#x5176;&#x6587;&#x6CD5;&#x4E3A;&#xFF1A;</p>
<pre><code>&lt;factor&gt; ::= Identifier | &apos;*&apos; &lt;factor&gt; | &apos;&amp;&apos; &lt;factor&gt; | ...
</code></pre><p>&#x4E0B;&#x9762;&#x7ED9;&#x51FA;&#x4E86;&#x7528;&#x4E8E;&#x751F;&#x6210;&#x6C47;&#x7F16;&#x7801;&#x7684;&#x4F2A;&#x4EE3;&#x7801;&#xFF1A;</p>
<pre><code class="lang-js"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">visitFactor</span>(<span class="hljs-params">ctx</span>) </span>{
    <span class="hljs-keyword">if</span> (ctx ::= Ident) {                <span class="hljs-comment">// &lt;factor&gt; ::= Identifier</span>
        emitAddress(Ident);             <span class="hljs-comment">// &#x8BA1;&#x7B97;&#x53D8;&#x91CF; Ident &#x7684;&#x5730;&#x5740;</span>
        <span class="hljs-keyword">if</span> (ctx.isLValue) {
            <span class="hljs-comment">// do nothing               // &#x5982;&#x679C;&#x662F;&#x5DE6;&#x503C;&#xFF0C;&#x76F4;&#x63A5;&#x8FD4;&#x56DE;&#x5176;&#x5730;&#x5740;</span>
        } <span class="hljs-keyword">else</span> {
            emitLoad();                 <span class="hljs-comment">// &#x5426;&#x5219;&#xFF0C;&#x518D;&#x751F;&#x6210;&#x4E00;&#x6761; Load &#x6307;&#x4EE4;&#x6765;&#x53D6;&#x5F97;&#x53D8;&#x91CF;&#x7684;&#x503C;</span>
        }
    } <span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> (ctx ::= <span class="hljs-string">&apos;*&apos;</span> factor) {    <span class="hljs-comment">// &lt;factor&gt; ::= &apos;*&apos; &lt;factor&gt;</span>
        visitFactor(factor);            <span class="hljs-comment">// &#x8BBF;&#x95EE;&#x5B50; factor &#x8BA1;&#x7B97;&#x5176;&#x503C;</span>
        <span class="hljs-keyword">if</span> (ctx.isLValue) {
            <span class="hljs-comment">// do nothing               // &#x5982;&#x679C;&#x662F;&#x5DE6;&#x503C;&#xFF0C;&#x76F4;&#x63A5;&#x8FD4;&#x56DE;&#x8BE5;&#x503C;</span>
        } <span class="hljs-keyword">else</span> {
            emitLoad();                 <span class="hljs-comment">// &#x5426;&#x5219;&#xFF0C;&#x518D;&#x751F;&#x6210;&#x4E00;&#x6761; Load &#x6307;&#x4EE4;&#x6765;&#x89E3;&#x5F15;&#x7528;</span>
        }
    } <span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> (ctx ::= <span class="hljs-string">&apos;&amp;&apos;</span> factor) {    <span class="hljs-comment">// &lt;factor&gt; ::= &apos;&amp;&apos; &lt;factor&gt;</span>
        visitFactor(factor);            <span class="hljs-comment">// &#x5B50; factor &#x4E00;&#x5B9A;&#x662F;&#x5DE6;&#x503C;&#xFF0C;&#x76F4;&#x63A5;&#x8BBF;&#x95EE;&#x4EE5;&#x5F97;&#x5230;&#x5176;&#x5730;&#x5740;</span>
    } <span class="hljs-keyword">else</span> {
        <span class="hljs-comment">// ...</span>
    }
}
</code></pre>
<h3 id="&#x751F;&#x6210;&#x5DE6;&#x503C;&#x7684;&#x5730;&#x5740;">&#x751F;&#x6210;&#x5DE6;&#x503C;&#x7684;&#x5730;&#x5740;</h3>
<p>&#x5982;&#x4E0A;&#x4E00;&#x8282;&#x6240;&#x8FF0;&#xFF0C;&#x5DE6;&#x503C;&#x53EA;&#x53EF;&#x80FD;&#x51FA;&#x73B0;&#x5728;&#x4E24;&#x79CD;&#x5730;&#x65B9;&#xFF1A;</p>
<ol>
<li>&#x6807;&#x8BC6;&#x7B26;&#xFF1A;&#x5730;&#x5740;&#x5373;&#x8BE5;&#x53D8;&#x91CF;&#x7684;&#x5730;&#x5740;&#xFF1B;</li>
<li>&#x89E3;&#x5F15;&#x7528;&#x7B26; <code>*</code> &#x4E4B;&#x540E;&#xFF1A;&#x5730;&#x5740;&#x5373;&#x4E4B;&#x540E;&#x90A3;&#x90E8;&#x5206;&#x7684;&#x503C;&#xFF1B;</li>
</ol>
<p>&#x7B2C;&#x4E8C;&#x79CD;&#x60C5;&#x51B5;&#x53EF;&#x76F4;&#x63A5;&#x5FFD;&#x7565;&#xFF0C;&#x6211;&#x4EEC;&#x53EA;&#x9700;&#x8003;&#x8651;&#x5982;&#x4F55;&#x8BA1;&#x7B97;&#x4E00;&#x4E2A;&#x53D8;&#x91CF;&#x7684;&#x5730;&#x5740;&#x3002;&#x5728;&#x4E0A;&#x4E00;&#x4E2A; lab &#x6211;&#x4EEC;&#x5F15;&#x5165;&#x4E86;&#x5168;&#x5C40;&#x53D8;&#x91CF;&#xFF0C;&#x6240;&#x4EE5;&#x53D8;&#x91CF;&#x53EF;&#x5206;&#x4E3A;&#x4E24;&#x79CD;&#xFF1A;</p>
<ul>
<li>&#x5C40;&#x90E8;&#x53D8;&#x91CF;&#xFF1A;&#x4FDD;&#x5B58;&#x5728;&#x6808;&#x4E0A;&#xFF0C;&#x4F7F;&#x7528; <code>lw t0, offset(fp)</code> &#x6307;&#x4EE4;&#x83B7;&#x53D6;&#x5176;&#x503C;&#x3002;&#x7531;&#x4E8E;&#x6211;&#x4EEC;&#x4F7F;&#x7528;&#x6808;&#x6765;&#x4F20;&#x53C2;&#xFF0C;&#x6240;&#x4EE5;&#x53C2;&#x6570;&#x4E5F;&#x53EF;&#x8BA4;&#x4E3A;&#x662F;&#x5C40;&#x90E8;&#x53D8;&#x91CF;&#x3002;</li>
<li>&#x5168;&#x5C40;&#x53D8;&#x91CF;&#xFF1A;&#x4FDD;&#x5B58;&#x5728;&#x6570;&#x636E;&#x6BB5;&#xFF0C;&#x4F7F;&#x7528; <code>lui t1, %hi(N); lw t0, %lo(N)(t1)</code> &#x6307;&#x4EE4;&#x83B7;&#x53D6;&#x5176;&#x503C;&#x3002;</li>
</ul>
<p>&#x8981;&#x4ECE;&#x53D6;&#x503C;&#x53D8;&#x6210;&#x53D6;&#x5730;&#x5740;&#xFF0C;&#x53EA;&#x9700;&#x5C06; <code>lw</code> &#x6539;&#x6210; <code>addi</code>&#xFF1A;</p>
<pre><code class="lang-asm">addi t0, fp, offset     # &#x83B7;&#x53D6;&#x5C40;&#x90E8;&#x53D8;&#x91CF;&#x7684;&#x5730;&#x5740;&#xFF0C;&#x4FDD;&#x5B58;&#x5230; t0

lui t1, %hi(N)
addi t0, t1, %lo(N)     # &#x83B7;&#x53D6;&#x5168;&#x5C40;&#x53D8;&#x91CF; N &#x7684;&#x5730;&#x5740;&#xFF0C;&#x4FDD;&#x5B58;&#x5230; t0
</code></pre>
<p>&#x4E4B;&#x540E;&#xFF0C;&#x53EF;&#x518D;&#x7528;&#x4E00;&#x6761; Load &#x6216; Store &#x6307;&#x4EE4;&#x6765;&#x5B9E;&#x73B0;&#x83B7;&#x53D6;&#x53D8;&#x91CF;&#x7684;&#x503C;&#x6216;&#x7ED9;&#x53D8;&#x91CF;&#x8D4B;&#x503C;&#xFF1A;</p>
<pre><code class="lang-asm">lw t1, 0(t0)    # &#x8BFB;&#x53D6;&#x5185;&#x5B58;&#x5730;&#x5740; t0 &#x4E2D;&#x7684;&#x5185;&#x5BB9;&#x5230; t1
sw t1, 0(t0)    # &#x5C06; t1 &#x5199;&#x5165;&#x5185;&#x5B58;&#x5730;&#x5740; t0
</code></pre>
<h3 id="&#x8D4B;&#x503C;&#x8BED;&#x53E5;">&#x8D4B;&#x503C;&#x8BED;&#x53E5;</h3>
<p>&#x6700;&#x540E;&#xFF0C;&#x6211;&#x4EEC;&#x8FD8;&#x9700;&#x8981;&#x4FEE;&#x6539;&#x8D4B;&#x503C;&#x8BED;&#x53E5;&#x7684;&#x751F;&#x6210;&#x8FC7;&#x7A0B;&#x3002;&#x5728;&#x4E4B;&#x524D;&#x7684;&#x8BED;&#x6CD5;&#x5206;&#x6790;&#x9636;&#x6BB5;&#xFF0C;&#x8D4B;&#x503C;&#x8BED;&#x53E5;&#x7684;&#x6587;&#x6CD5;&#x5DF2;&#x7ECF;&#x6539;&#x4E3A;&#x4E86;</p>
<pre><code class="lang-diff"><span class="hljs-deletion">-&lt;exp&gt; ::= Identifier &quot;=&quot; &lt;exp&gt; | &lt;conditional-exp&gt;</span>
<span class="hljs-addition">+&lt;exp&gt; ::= &lt;factor&gt; &quot;=&quot; &lt;exp&gt; | &lt;conditional-exp&gt;</span>
</code></pre>
<p>&#x5176;&#x4E2D;&#x8981;&#x6C42; <code>&lt;factor&gt;</code> &#x662F;&#x4E00;&#x4E2A;&#x5DE6;&#x503C;&#x3002;</p>
<p>&#x6211;&#x4EEC;&#x5728;&#x4E4B;&#x524D;&#x751F;&#x6210;&#x8D4B;&#x503C;&#x8BED;&#x53E5;&#x65F6;&#x662F;&#x8FD9;&#x4E48;&#x505A;&#x7684;&#xFF1A;</p>
<pre><code class="lang-asm">&#x751F;&#x6210; expr &#x7684;&#x4EE3;&#x7801;      # &#x7ED3;&#x679C;&#x5B58;&#x5728; t0
sw t0, offset(fp)   # offset &#x4E3A;&#x53D8;&#x91CF;&#x5728;&#x6808;&#x5E27;&#x4E2D;&#x7684;&#x4F4D;&#x7F6E;
</code></pre>
<p>&#x73B0;&#x5728;&#xFF0C;&#x5DF2;&#x7ECF;&#x6CA1;&#x6709;&#x53D8;&#x91CF;&#x4E86;&#xFF0C;&#x800C;&#x662F;&#x53D8;&#x6210;&#x4E86;&#x5DE6;&#x503C;&#x3002;&#x6211;&#x4EEC;&#x5C31;&#x5148;&#x751F;&#x6210;&#x8BA1;&#x7B97;&#x5DE6;&#x503C;&#x5730;&#x5740;&#x7684;&#x4EE3;&#x7801;&#xFF0C;&#x7136;&#x540E;&#x518D;&#x751F;&#x6210;&#x4E00;&#x6761; Store &#x6307;&#x4EE4;&#x5373;&#x53EF;&#xFF1A;</p>
<pre><code class="lang-asm">&#x751F;&#x6210; factor &#x7684;&#x4EE3;&#x7801;  # &#x7ED3;&#x679C;&#xFF08;&#x5DE6;&#x503C;&#x7684;&#x5730;&#x5740;&#xFF09;&#x5B58;&#x5728; t0
&#x751F;&#x6210; expr &#x7684;&#x4EE3;&#x7801;    # &#x7ED3;&#x679C;&#x5B58;&#x5728; t1
sw t1, 0(t0)      # &#x5C06; t1 &#x5199;&#x5165;&#x5185;&#x5B58;&#x5730;&#x5740; t0
</code></pre>

                                
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